Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3829f6d35ee3d1b…

MALICIOUS

PDF

82.8 KB Created: 2021-04-09 11:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 14b3ccaa9e730f92043d8b5989834795 SHA-1: e933a57514eca2d5d6980a7c4f30233f27f2abb1 SHA-256: b3829f6d35ee3d1b63aa89aa67fd40bfe55c4beac547f6d8a15d78a1341f9126
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/strik?utm_term=world+map+printable+with+continents+and+oceans PDF link annotation
    • http://gokawojop.scienceontheweb.net/dufivisob.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/jdjdOii/nextbike_customer_service.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/sHhghhb/disenteria_bacteriana_pediatria.pdfIn PDF document text
    • http://mofemaruwek.sportsontheweb.net/61781144619.pdfIn PDF document text
    • http://lokubakodo.getenjoyment.net/18646319840.pdfIn PDF document text
    • http://datujizid.iblogger.org/daxuwapakojuna.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/Xdjb7jg/101_okey_indir_internetsiz_pc_icin.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/jdjg5jj/bukitidizinojomevogu.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/jivasixuviligifasexapuna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tasenos.epizy.com/dungeons_and_dragons_movie_director.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/how_to_play_harlequins_kill_team.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_92638305d4f04acf8898bc08092edfbb.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_012987d9ce504eb3ae9b5e3b6f165a71.pdf?index=trueIn PDF document text
    • http://jikokajogov.rf.gd/vidyasiri_scholarship_2019_application_form_date.pdfIn PDF document text
    • http://wizajevul.epizy.com/how_to_develop_a_super_memory_masterclass.pdfIn PDF document text
    • http://damoserik.epizy.com/tactics_for_listening_developing.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_dc0f48a751f9401887aa22195ad6a1be.pdf?index=trueIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_7618b52494604d6cb7d21c06c7adb00c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 5556 bytes
SHA-256: bacbbbca48c1f7c2d8c490c04cca623a29e235a59c6cd7401b35c06d467813dd
font_01_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 10928 bytes
SHA-256: 9ebb37d8eda73e0c0ed204066eec3ad6a3adf1ba62ce5652222145f008ec915e
font_02_sfnt_off00012704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12704 16448 bytes
SHA-256: bc6d684f813ac1c32be8bd0fe15b7813cdddcd900b6f98dcbbe4bb93017ec79b

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